Backport PR #4023 on branch 1.12.x (fix: avoid cumulative size reordering across multi-color subplots)

[meeseeksmachine]

Backport PR #4023: fix: avoid cumulative size reordering across multi-color subplots

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.47%. Comparing base (5166e57) to head (291c36e).
⚠️ Report is 1 commits behind head on 1.12.x.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           1.12.x    #4075      +/-   ##
==========================================
- Coverage   78.47%   78.47%   -0.01%     
==========================================
  Files         119      119              
  Lines       12624    12623       -1     
==========================================
- Hits         9907     9906       -1     
  Misses       2717     2717              

Flag	Coverage Δ
hatch-test.low-vers	77.77% <100.00%> (-0.01%)	⬇️
hatch-test.pre	78.35% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/scanpy/plotting/_tools/scatterplots.py	83.48% <100.00%> (-0.04%)	⬇️